/*
* Copyright 2014-2015 MongoDB, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.mongodb.async.client;
import com.mongodb.Block;
import com.mongodb.Function;
import com.mongodb.async.SingleResultCallback;
import com.mongodb.async.AsyncBatchCursor;
import com.mongodb.operation.AsyncOperationExecutor;
import com.mongodb.operation.AsyncWriteOperation;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import static com.mongodb.assertions.Assertions.notNull;
class AwaitingWriteOperationIterable<T, W> implements MongoIterable<T> {
private final MongoIterable<T> delegated;
private final List<SingleResultCallback<Void>> callbacks = new ArrayList<SingleResultCallback<Void>>();
private boolean writeCompleted;
private Throwable thrown;
AwaitingWriteOperationIterable(final AsyncWriteOperation<W> writeOperation, final AsyncOperationExecutor executor,
final MongoIterable<T> delegated) {
this.delegated = delegated;
executor.execute(writeOperation, new SingleResultCallback<W>() {
@Override
public void onResult(final W result, final Throwable t) {
synchronized (AwaitingWriteOperationIterable.this) {
writeCompleted = true;
thrown = t;
for (SingleResultCallback<Void> cur : callbacks) {
cur.onResult(null, t);
}
}
}
});
}
@Override
public void first(final SingleResultCallback<T> callback) {
notNull("callback", callback);
boolean localWriteCompleted;
synchronized (this) {
localWriteCompleted = writeCompleted;
if (!localWriteCompleted) {
callbacks.add(new SingleResultCallback<Void>() {
@Override
public void onResult(final Void result, final Throwable t) {
if (t != null) {
callback.onResult(null, t);
} else {
delegated.first(callback);
}
}
});
}
}
if (localWriteCompleted) {
if (thrown != null) {
callback.onResult(null, thrown);
} else {
delegated.first(callback);
}
}
}
@Override
public void forEach(final Block<? super T> block, final SingleResultCallback<Void> callback) {
notNull("block", block);
notNull("callback", callback);
boolean localWriteCompleted;
synchronized (this) {
localWriteCompleted = writeCompleted;
if (!localWriteCompleted) {
callbacks.add(new SingleResultCallback<Void>() {
@Override
public void onResult(final Void result, final Throwable t) {
if (t != null) {
callback.onResult(null, t);
} else {
delegated.forEach(block, callback);
}
}
});
}
}
if (localWriteCompleted) {
if (thrown != null) {
callback.onResult(null, thrown);
} else {
delegated.forEach(block, callback);
}
}
}
@Override
public <A extends Collection<? super T>> void into(final A target, final SingleResultCallback<A> callback) {
notNull("target", target);
notNull("callback", callback);
boolean localWriteCompleted;
synchronized (this) {
localWriteCompleted = writeCompleted;
if (!localWriteCompleted) {
callbacks.add(new SingleResultCallback<Void>() {
@Override
public void onResult(final Void result, final Throwable t) {
if (t != null) {
callback.onResult(null, t);
} else {
delegated.into(target, callback);
}
}
});
}
}
if (localWriteCompleted) {
if (thrown != null) {
callback.onResult(null, thrown);
} else {
delegated.into(target, callback);
}
}
}
@Override
public <U> MongoIterable<U> map(final Function<T, U> mapper) {
return new MappingIterable<T, U>(this, mapper);
}
@Override
public AwaitingWriteOperationIterable<T, W> batchSize(final int batchSize) {
delegated.batchSize(batchSize);
return this;
}
@Override
public void batchCursor(final SingleResultCallback<AsyncBatchCursor<T>> callback) {
notNull("callback", callback);
boolean localWriteCompleted;
synchronized (this) {
localWriteCompleted = writeCompleted;
if (!localWriteCompleted) {
callbacks.add(new SingleResultCallback<Void>() {
@Override
public void onResult(final Void result, final Throwable t) {
if (t != null) {
callback.onResult(null, t);
} else {
delegated.batchCursor(callback);
}
}
});
}
}
if (localWriteCompleted) {
if (thrown != null) {
callback.onResult(null, thrown);
} else {
delegated.batchCursor(callback);
}
}
}
}